On February 20, 1915, the Panama-Pacific Exposition opened in San Francisco, California. It honored the discovery of the Pacific Ocean and the completion of the Panama Canal. The Post Office Department began planning a set of commemoratives for the exposition in 1904. By 1912, nine designs were on sale. Since the exposition didn’t open until 1915, the Panama-Pacific stamps remained current for nearly three years – longer than any other commemoratives!
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